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[nova][ptg]Support volume local cache



LiangFang to update the spec based on the discussion in the room[1]:
* use traits to driver scheduling. The cache is not sliced per instance 
so it cannot be a resource class
* document the alternative between doing a hard scheduling decision or 
only implement caching as a best effort optimization for the guest.
* document the alternative to do the whole cache management on libvirt 
(or QEMU) level